Contents: Abstract; Public Report Summary; Introduction: 1.1 Project Location; 1.2 Environmental Setting; 1.2.1 Topography and Hydrology; 1.2.2 Project Soils; 1.2.3 Land Use; 2.0 Research Design; 3.0 Cultural Background; 3.1 Prehistoric Context; 3.1.1 Paleoindian Period; 3.1.2 Archaic Period; 3.1.3 Woodland Period; 3.2 Historic Context; 3.2.1 Early National Period—Antebellum Period 3.2.2 Civil War; 3.2.3 Reconstruction and Gilded Age; 3.2.4 World War I to World War II; 3.2.5 Cold War ; 3.2.6 Post-Cold War Era; 4.0 Previous Investigations; 4.1 Archaeological Investigations; 4.2 Previously Recorded Sites; 4.3 Previously Recorded Above-Ground Resources; 5.0 Methods; 5.1 Background Research; 5.2 Field Methods; 5.2.1 Geophysical Survey; 5.2.2 Archaeological Survey; 5.3 Data Processing and Laboratory Methods; 5.3.1 Geophysical Data Processing; 5.3.2 Archaeological Laboratory Methods. 6.0 Field Results; 6.1 Results of Geophysical Survey; 6.1.1 Summary Results; 6.1.2 DC Penitentiary ; 6.1.3 Washington Arsenal-Parade Ground; 6.1.4 Washington Arsenal---SE War College; 6.2 Results of Archaeological Survey; 6.2.1 DC Penitentiary; 6.2.2 Washington Arsenal—Parade Ground; 6.2.3 Washington Arsenal—SE War College; 7.0 Interpretations; 7.1 DC Penitentiary; 7.2 Washington Arsenal-Parade Ground; 7.3 Washington Arsenal-SE War College; 8.0 Summary and Recommendations; 8.1 Summary and Recommendations; 8.2 NRHP Evaluation. 9.0 References Cited; List of Appendices; List of Tables; List of Figures.